\(\diamond \)  SRM and PSRM
There are still other state-of-the-art feature extractors that researchers take into account: Spatial Rich Model (SRM) [1]}, which provides 34,671 features; projected SRM (PSRM), which extracts 12,870 features [2]}; and CHEN[3]}, which is the first common feature extractor that generates 486 features.
